Bulletin Volume 292-297

Bulletin Volume 292-297

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...10 15. Heavy-bedded, typical Galena; hard, crystalline and relatively f.0:3 from chert; in ledges 3 to 6 feet in thickness 70 14. Bed containing pockets of calcite, the calcito in some eases forming large crystals 3 13. Bed containing large quantities of chert 4 12. Ledges showing the characteristics of the typical Galena; hard, compact, crystalline, completely dolomitized, with small amount of chert 18 11. Thick, massive beds with large amount of chert 12 10. Thick beds of crystalline dolomite, the ordinary type 6 9. I-cdgc varying in texture, containing small pockets of calcite and some chert; a single specimen of Reeeptaculites found in this ledge 4 8. Heavy ledge nearly on level with the top of limekiln 3 7. Dolomite varying in aspect according to degree of weathering; at Eagle Point showing bedding planes 10 to 18 Inches apart, a few nodules of flint and numerous specimens of Reeeptaculites oweni marking the lower Reeeptaculites zone 15 6. Massive, crystalline dolomite; bodding planes almost completely obliterated 20 5. Incompletely dolomitized beds with shaly partings at intervals of 6, 8, or 10 inches 10 4. Limestone, earthy, incompletely dolomitized 2 3. Oil rock, carbonaceous shale, weathering to brown earthy matter J 2. Glass rock; thin-bedded, brittle, nonmagnesian limestone in 2 to 3 inch layers with irregular clayey partings 3 1. Shales, green, argillaceous, abundantly fossiliferous; exposed 3 Above the beds in this section is a considerable thickness represented in the following section measured on Hill street by Professor Calvin: " Section of Galena limestone, on Hill street, Dubuque. Feet. 2. Thin-bedded Galena limestone, earthy, noncrystalline; the layers ranging from 10 to 12 inches near the base to less than 3...show more

Product details

  • Paperback | 338 pages
  • 189 x 246 x 18mm | 603g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236766172
  • 9781236766175